DIN 6796 High Duty Safety Spring Washers
| High duty safety spring washers are designed for use as loose washers over screws and bolts. Manufactured to DIN 6796 they are designed to be used for medium or high strength screw or bolt assemblies.The high supporting load and spring return make the HDS series extremely effective where bolt tension may be subject to relaxation due to such factors as : smoothing out of wear parts, creep, relaxation, thermal expansion or contraction, or compression set of gaskets. The HDS series multiplies the elastic action of the screw. They are an effective replacement for the time honored, but obsolete and ineffective, lock washer / flat washer combinations. |
Since the HDS series are disc springs they can be stacked in series and/or in parallel. Series stacking increases the available deflection of the spring stack. Parallel stacking increases the spring force.
The desired installation is as near flat as possible. When nearing flat, the tightening torque increases sharply, indicating the proper bolt tension without a torque wrench.
HDS washers, hardened (43-48 Rc), are made of Carbon Spring Steel, larger sizes having machined OD and ID. Other materials are available on request. HDS washers are delivered with blank, slightly oiled surfaces. Phosphate and Zinc plating on request.
| Diameter | Bolt Size Inch | OD Inch | ID | t | H max * | H min # | F (lb) | OD mm | ID | t | H max * | H min # | F (N) + |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M2 | 0.197 | 0.087 | 0.016 | 0.024 | 0.020 | 140 | 5 | 2.2 | 0.40 | 0.60 | 0.50 | 630 | |
| M2.5 | 0.236 | 0.106 | 0.020 | 0.028 | 0.024 | 210 | 6 | 2.7 | 0.50 | 0.72 | 0.61 | 950 | |
| M3 | 1/8 .#5 | 0.276 | 0.126 | 0.024 | 0.033 | 0.028 | 300 | 7 | 3.2 | 0.60 | 0.85 | 0.72 | 1,320 |
| M3.5 | .#6 | 0.315 | 0.146 | 0.031 | 0.042 | 0.036 | 540 | 8 | 3.7 | 0.80 | 1.06 | 0.92 | 2,400 |
| M4 | 5/32.#8 | 0.354 | 0.169 | 0.039 | 0.051 | 0.044 | 850 | 9 | 4.3 | 1.00 | 1.30 | 1.12 | 3,800 |
| M5 | 3/16.#10 | 0.433 | 0.209 | 0.047 | 0.061 | 0.053 | 1,230 | 11 | 5.3 | 1.20 | 1.55 | 1.35 | 5,500 |
| M6 | 1/4 | 0.551 | 0.252 | 0.059 | 0.079 | 0.067 | 1,930 | 14 | 6.4 | 1.50 | 2.00 | 1.70 | 8,600 |
| M7 | 0.669 | 0.291 | 0.069 | 0.091 | 0.079 | 2,540 | 17 | 7.4 | 1.75 | 2.30 | 2.00 | 11,300 | |
| M8 | 5/16 | 0.709 | 0.331 | 0.079 | 0.102 | 0.088 | 3,360 | 18 | 8.4 | 2.00 | 2.60 | 2.24 | 14,900 |
| M10 | 3/8 | 0.906 | 0.413 | 0.098 | 0.126 | 0.110 | 4,970 | 23 | 10.5 | 2.50 | 3.20 | 2.80 | 22,100 |
| M12 | 1/2 | 1.142 | 0.512 | 0.118 | 0.156 | 0.135 | 7,670 | 29 | 13.0 | 3.00 | 3.95 | 3.43 | 34,100 |
| M14 | 9/16 | 1.378 | 0.591 | 0.138 | 0.183 | 0.159 | 10,340 | 35 | 15.0 | 3.50 | 4.65 | 4.04 | 46,000 |
| M16 | 5/8 | 1.535 | 0.669 | 0.157 | 0.207 | 0.180 | 13,400 | 39 | 17.0 | 4.00 | 5.25 | 4.58 | 59,700 |
| M18 | 1.653 | 0.748 | 0.177 | 0.228 | 0.200 | 16,700 | 42 | 19.0 | 4.50 | 5.80 | 5.08 | 74,400 | |
| M20 | 3/4 | 1.772 | 0.827 | 0.197 | 0.252 | 0.220 | 21,000 | 45 | 21.0 | 5.00 | 6.40 | 5.60 | 93,200 |
| M22 | 7/8 | 1.929 | 0.906 | 0.217 | 0.278 | 0.242 | 25,600 | 49 | 23.0 | 5.50 | 7.05 | 6.15 | 114,000 |
| M24 | 2.205 | 0.984 | 0.236 | 0.305 | 0.267 | 29,400 | 56 | 25.0 | 6.00 | 7.75 | 6.77 | 131,000 | |
| M27 | 1 | 2.362 | 1.102 | 0.256 | 0.329 | 0.287 | 34,600 | 60 | 28.0 | 6.50 | 8.35 | 7.30 | 154,000 |
| M30 | 1 1/8 | 2.756 | 1.220 | 0.276 | 0.362 | 0.315 | 38,700 | 70 | 31.0 | 7.00 | 9.20 | 8.00 | 172,000 |
| FMP Part Number = W096-Diameter-0000 (Bare Steel)FMP Part Number = W096-Diameter-0000-ZN (Zinc Plated)
( * )Overall height before set out ( # )Overall height after set out ( + )Approx. force to flatten. Twice calculated force at deflection Hmin – S |
All information is strictly informative